package com.wn.class30.tools;


import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.sun.net.httpserver.HttpContext;
import org.apache.catalina.core.ApplicationContext;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.function.ServerResponse;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.swing.filechooser.FileSystemView;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;

    public class QrCodeUtil {
        public static String geturl(HttpServletRequest req, int bussinessId) {
            String url = req.getScheme()+"://"+ req.getServerName()+"/weixin/wexinPay?bussinessId="+bussinessId;//需要转化二维码的地址链接
            System.out.println(url);
            String path = FileSystemView.getFileSystemView().getHomeDirectory() + File.separator + "testQrcode"; //图片保存的位置,自定义
            System.out.println(path);
            String fileName = bussinessId+".jpg"; //图片名称
            createQrCode(url, path, fileName);
            return path+"/"+fileName;
        }
        public static String createQrCode(String url, String path, String fileName) {
            try {
                Map<EncodeHintType, String> hints = new HashMap<>();
                hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
                BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, 400, 400, hints);
                File file = new File(path, fileName);
                if (file.exists() || ((file.getParentFile().exists() || file.getParentFile().mkdirs()) && file.createNewFile())) {
                    writeToFile(bitMatrix, "jpg", file);
                    System.out.println("搞定：" + file);
                }

            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }

        static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
            BufferedImage image = toBufferedImage(matrix);
            if (!ImageIO.write(image, format, file)) {
                throw new IOException("Could not write an image of format " + format + " to " + file);
            }
        }

        static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
            BufferedImage image = toBufferedImage(matrix);
            if (!ImageIO.write(image, format, stream)) {
                throw new IOException("Could not write an image of format " + format);
            }
        }

        private static final int BLACK = 0xFF000000;
        private static final int WHITE = 0xFFFFFFFF;

        private static BufferedImage toBufferedImage(BitMatrix matrix) {
            int width = matrix.getWidth();
            int height = matrix.getHeight();
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            for (int x = 0; x < width; x++) {
                for (int y = 0; y < height; y++) {
                    image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
                }
            }
            return image;
        }


    }




